xzone reactor

For a large number of data acquisition in addition to multithreading, it is only asynchronous to achieve. This paper is based on the twisted framework to achieve asynchronous acquisition, Async Batching with twisted:a Walkthrough Example 1:just a Defferedlist code is as follows copy code from Twisted.internet Import reactor from twisted.web.client import getpage from Twisted.internet.defer Import Deferredlist def

The master process is primarily used to ensure the operation of the Swoole framework mechanism. It creates several functional threads: Reactor thread: A thread that really handles TCP connections, sending and receiving data. The main thread of the Swoole will assign this connection to a fixed reactor thread after the new connection is held and the thread is responsible for listening to the socket. Re

In the open-source C + + network library, commonly used in a few, the industry's highest visibility, it should be ace, but a heavyweight big, lightweight with libevent, Libev, and boost ASIO.ACE is a large-scale middleware product, the code is about 200,000 lines, too ambitious, a bunch of design patterns, the structure of a layer after layer, when using, depending on the situation, see you from that layer to use. Support cross-platform.The boost ASIO is an asynchronous IO library that encapsula

multiplexer can poll multiple channel simultaneously, and because the JDK uses epoll instead of the select implementation, there is no limit to the maximum connection handle. (Off-topic, here said EOPLL, select is said that the Linux under the IO multiplexing, and select, Epoll, clear process concept, please see the source directly).NIO service-side sequence diagram1. Open Serversocketchannel, which listens to the client's connection, which is the parent pipe for all client connections.Serverso

Twisted is a very imaginative framework. I have been impressed by its code. I think Twisted may only be used when I use python to develop a network application. However, to truly achieve performance optimization, we still need to apply Twisted tools well in our programs. The most common situation is that we add a long processing process to a non-blocking application to achieve the blocking effect, this allows everyone to wait for a long job as a comrade. Let's take a look at the following code:

); if (r I/O multiplexing modeThere are two classic modes of I/O Multiplexing: Reactor based on synchronous I/O and proactor based on asynchronous I/O.reactorO an event handler claims that it is interested in reading events on a socket;o The event separator is waiting for the event to occur;o When the event has occurred, the event splitter is awakened, which is responsible for notifying the previous event handler;o The event handler

. Similar to select and epoll, you can directly view the source code for clear process concepts ). NIO server sequence diagram ServerSocketChannel accptorSvr = ServerSocketChannel. open (); 2. Bind the listening port and set the connection to non-blocking mode. acceptorSvr.socket().bind(　　new InetSocketAddress(InetAddress.getByName("IP"),port));acceptorSvr.configureBlocking(false); 3. Create a Reactor thread, create a multiplexing instance, and start

, so as to avoid a lot of useless operations. At this time, the socket should adopt Non-Blocking Mode. In this way, the entire process will be blocked only when the select, poll, and epoll calls are called. Sending and receiving client messages will not be blocked, and the whole process or thread will be fully utilized. Event-drivenThe reactor mode. Method: windows python： Available: select Mac Python： Available: select Linux Python： Available: select

/Computers/Programming/Languages/Python/Books/", "http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/" ] def parse(self, response): For sel in response. XPath('//ul/li '): item = dmozitem () item[ ' title ' ]= sel xpath ( ' A/text () ' ) extract () item[ ' link ' ]= sel xpath ( ' A/@href ' extract () Item[' desc '] = sel. XPath(' text () '). Extract() yield item Next we need to write a script run.py to r

say it is in conflict with other program addresses or ports. But I have tested and found that none of them works. In addition, during running, it is found that the twisted server must be in the main thread; otherwise, the signal must be accepted in the main thread, however, the twisted reactor is blocked once it is run. In the twisted document, there is also a UDP called connected UDP, abnormal. The so-called connected UDP means that only data can b

Swoole framework mechanism. It creates several functional threads: Reactor thread: A thread that really handles TCP connections, sending and receiving data. The main thread of the Swoole will assign this connection to a fixed reactor thread after the new connection is held and the thread is responsible for listening to the socket. Reads the data when the socket is readable and parses the protocol to

connection is retained, and the server waits for the next request.KeepAlive is not enabled, and the server will disconnect $ Response object is destroyed after end (). the http response is complete and the business code will not be executed. Http://wiki.swoole.com/wiki/p...It can be understood that the reactor is nginx, and the worker is php-fpm. The reactor thread processes network requests asynchronou

ensure the operation of the Swoole framework mechanism. It creates several functional threads: Reactor thread: A thread that really handles TCP connections, sending and receiving data. The main thread of the Swoole will assign this connection to a fixed reactor thread after the new connection is held and the thread is responsible for listening to the socket. Reads the data when the socket is reada

Comparing high-performance I/O Design Patternsby Alexander Libman with Vladimir GilbourdReactor and proactor:two I/O multiplexing approachesin general, I/O multiplexing mechanisms rely on a event demultiplexor, an object that dispatches I/O even TS from a limited number of sources to the appropriate Read/write event handlers. The developer registers interest in specific events and provides event handlers, or callbacks. The event Demultiplexor delivers the requested events to the event handlers

Poco library Chinese programming Reference Guide (8) rich socket programming Author: Liu Da-poechant Blog: blog.csdn.net/poechant Email: zhongchao. USTC # gmail.com (#-> @) Date: 10000l 16Th, 2012 1 socket in poco Poco has rich socket encapsulation. The inheritance relationship is as follows: This article only introduces streamsocket, serversocket, and initramsocket.2 poco: Net: serversocket Serversocket is a socket with a low encapsulation level. It uses TCP connections. The tcpserver or

them works. In addition, during running, it is found that the twisted server must be in the main thread; otherwise, the signal must be accepted in the main thread, however, the twisted reactor is blocked once it is run. In the twisted document, there is also a UDP called connected UDP, abnormal. The so-called connected UDP means that only data can be sent and received from one address. It looks like it can, however, non-conforming data can be receive

The illusion that twisted uses multi-core CPU Twisted provides a thread delay call model. Twisted itself is an event model. After calling a thing, it can delay processing and callback. However, these event-based processing operations are actually executed in a thread, or the event loop reactor. run () is actually running in the main thread. The thread delay call model can use the delay callback function after a thread is started. This is the diffe